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Colour marking of Copper with lasers

Author name:

Andrew Dunn

Affiliation:

Heriot-Watt University

Description:

Lasers can be used to generate colour marks on engineering metals for various applications including anti-counterfeiting and aesthetic marking. Using a high power lasers, a range of colour marks have been generated on copper and steel. This is an SEM image of a colour mark on copper; feature size <1µm.